Dependent Listboxes in ALV

Hi,

I need to display two listboxes in alv.I need the containts of second list box should come on the base of first list box.

For example: If in my listbox there are two options say 'Teacher' and 'Student', then if I select 'Teacher' then 'Age' and 'Department' should appear in the second list box.If I select 'Student', then second listbox should display 'Class' 'Marks' etc.Please help me out.Thanks in advance.